Chronic obstructive pulmonary disease, is a progressive disease that makes it hard to breathe. Chronic bronchitis & emphysema are other names/stages of COPD. COPD can cause coughing that produces large amounts of mucus, wheezing, shortness of breath, chest tightness, and other symptoms.
Human bronchial/tracheal epithelial cells isolated from the epithelial cells that line the airway above the bifurcation of the lungs.